Openings up to 2NT

13-21 HCP and more than 3 Diamonds. If the Better Minor
optional
convention is implemented the suit may
contain only 3 Diamonds when the distribution is 4432

1 ♥,
1 ♠

13-21 HCP and at least 5 cards in the suit
opened

1NT

From 12-14 HCP up to 16-18 HCP (the level is
optional), no 5-card major, no singleton, no 6-card minor. With a
balanced hand too strong to open 1NT, and too weak to open 2NT, open 1
of a minor and jump in NT on the next round. You can opt to
open with a 5-card major suit and 5332 distribution, or even with a
6-card minor and 6322

2 ♣

Requires more than 22 HCP, can be void in Clubs

2 ♦, 2 ♥, 2 ♠

21-22 HCP and at least a 5-card suit.
Alternatively some or all of these openings can be played as weak